sigmamediumHunting

Suspicious File Created In PerfLogs

Detects suspicious file based on their extension being created in "C:\PerfLogs\". Note that this directory mostly contains ".etl" files

MITRE ATT&CK

T1059

execution

Detection Query

selection:
  TargetFilename|startswith: C:\PerfLogs\
  TargetFilename|endswith:
    - .7z
    - .bat
    - .bin
    - .chm
    - .dll
    - .exe
    - .hta
    - .lnk
    - .ps1
    - .psm1
    - .py
    - .scr
    - .sys
    - .vbe
    - .vbs
    - .zip
condition: selection

Author

Nasreddine Bencherchali (Nextron Systems)

Created

2023-05-05

Data Sources

windowsFile Events

Platforms

windows

References

Tags

attack.executionattack.t1059

Raw Content

title: Suspicious File Created In PerfLogs
id: bbb7e38c-0b41-4a11-b306-d2a457b7ac2b
status: test
description: Detects suspicious file based on their extension being created in "C:\PerfLogs\". Note that this directory mostly contains ".etl" files
references:
    - Internal Research
    - https://labs.withsecure.com/publications/fin7-target-veeam-servers
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-05-05
tags:
    - attack.execution
    - attack.t1059
logsource:
    category: file_event
    product: windows
detection:
    selection:
        TargetFilename|startswith: 'C:\PerfLogs\'
        TargetFilename|endswith:
            - '.7z'
            - '.bat'
            - '.bin'
            - '.chm'
            - '.dll'
            - '.exe'
            - '.hta'
            - '.lnk'
            - '.ps1'
            - '.psm1'
            - '.py'
            - '.scr'
            - '.sys'
            - '.vbe'
            - '.vbs'
            - '.zip'
    condition: selection
falsepositives:
    - Unlikely
level: medium